Search results for " Sviluppo"
showing 10 items of 1056 documents
Coupling of electromembrane processes with reverse osmosis for seawater desalination: Pilot plant demonstration and testing
2022
Reverse osmosis (RO) is the most widespread technology to produce drinking water from seawater (SW). However, the integration of different membrane processes offers interesting alternatives. In this work, electromembrane processes were integrated with RO to desalinate real seawater in a pilot plant with 25 m3/day capacity. Electrodialysis (ED, either two-stage or single stage), shortcut reverse electrodialysis (scRED) and assisted reverse electrodialysis (ARED) pre-desalinated seawater before RO with the ED-ED-RO, ED-RO, and scRED-ARED-RO process schemes. Treated wastewater was used as salt sink in the scRED-ARED tests. The performance of the pilot plant can be summarized as follows: water …
Il sostegno finanziario a sostegno dell'innovazione eco-compatibile tra forme tradizionali e moderne
2011
Experimental investigation of the effects of efficiency promoters in a MSF lab-scale unit
2006
Influence of bundle porosity on shell-side hydrodynamics and mass transfer in regular fiber arrays: A computational study
2023
CFD predictions of the effects of a fiber bundle porosity on shell-side hydrodynamics and mass transfer under conditions of steady laminar flow were obtained. Fluid was assumed to flow around regular hexag-onal or square arrays of cylindrical fibers of different pitch to diameter ratios, yielding bundle porosities ranging from the theoretical minimum up to similar to 1. A large number of axial, transverse and mixed flow combinations were simulated by letting the axial and transverse flow Reynolds numbers and the trans-verse flow attack angle vary. Both fully developed and developing conditions (entrance effects) were con-sidered. The continuity and momentum equations, along with a transport…
CFD prediction of shell-side flow and mass transfer in regular fiber arrays
2021
Numerical simulations were conducted for fully developed, steady-state flow with mass transfer in fiber bundles arranged in regular lattices. The porosity was 0.5 and the Schmidt number 500. Several combinations of axial flow, transverse flow and flow attack angles in the cross-section plane were considered. The axial and transverse Reynolds numbers Rez , ReT were made to vary from 10(^−4) to 10(^2). Concentration boundary conditions, and the definition of an average Sherwood number, were addressed. Results for the hydraulic permeability were compared with the literature. Both hexagonal and square lattices were found to be hydraulically almost isotropic up to transverse flow Reynolds number…
Mass transfer in ducts with transpiring walls
2019
Abstract The problem of mass transfer in ducts with transpiring walls is analysed: the concepts of “solvent” and “solute” fluxes are introduced, all possible sign combinations for these fluxes are considered, and relevant examples from membrane processes such as electrodialysis, reverse osmosis and filtration are identified. Besides the dimensionless numbers commonly defined in studying flow and mass transfer problems, new dimensionless quantities appropriate to transpiration problems are introduced, and their limiting values, associated with “drying”, “desalting” and “saturation” conditions, are identified. A simple model predicting the Sherwood number Sh under all possible flux sign combi…
La formazione iniziale degli insegnanti attraverso la pratica del microteaching.
2014
Le metodologie che fanno uso della videoregistrazione sono sempre più utilizzate nella formazione professionale dei futuri insegnanti. La professionalità del docente richiede oltre alle conoscenze teoriche o disciplinari, la capacità di mobilitare i saperi per organizzare risposte efficaci a problemi complessi e rilevanti e la capacità di riflettere sul proprio agire. È necessario che durante il percorso universitario l’insegnante in formazione acquisisca specifiche competenze e capacità autoriflessive. Questo contributo descrive una metodologia per la creazione di esperienze formative centrate sull’utilizzo della videoregistrazione e per la raccolta di dati sull’effetto del video sull’appr…
La formazione dell'agente di sviluppo di comunità: proposte e riflessioni
2007
LA TRANSIZIONE ALL’ETÀ ADULTA TRA I GIOVANI DEL NORD E DEL SUD ITALIA: LO STUDIO DI DUE CASI
2014
Introduzione. Gli esiti della transizione all’età adulta derivano sia dai contesti socio-demografici che da tratti psicologici-identitari individuali (Crocetti, et al. 2012). Diventare adulti è infatti il frutto congiunto di scelte individuali tra opportunità e vincoli di contesto. Date le sfaccettate differenze socio-economiche tra Nord e Sud d’Italia, il presente contributo si propone di porre a confronto alcuni aspetti dell’emerging adulthood in queste due aree geografiche attraverso due casi studio. Metodo. Lo Studio 1 ha coinvolto 160 studenti universitari di Torino e di Palermo (Metà=22.6; DS=2.77) analizzandone le differenze riguardo la soddisfazione nelle relazioni sentimentali, ami…
Depression, Anxiety at School and Self-Esteem in Children with Learning Disabilities
2014
Educational research places emphasis on the fact that pupils with Learning Disabilities may develop depressive and anxiety symptoms characterized by lower levels of self-esteem. The aim of this research is to compare the levels of depression, anxiety at school and self-esteem in children with learning disabilities, mathematical disabilities and a control group who showed typical learning. The participants were 132 children (52 girls and 80 boys), with an average age of 9 years, attending the fourth grade of primary school. These pupils were selected by scores on a battery of tests commonly used in Italy for the assessment of learning disabilities. On the whole, analyses revealed that childr…